facebook/lexical

Lexical is a toolkit for building text editors inside web applications. If you have ever wondered how apps like Notion, Google Docs, or a blog platform create their rich-text editing boxes, where you can bold text, add lists, insert images, and undo mistakes, Lexical is the kind of building block that powers those experiences. Rather than a finished editor you drop in, Lexical is a framework: a set of low-level pieces developers assemble into whatever editor they need. It is plugin-based, meaning features like spell check, tables, or collaborative editing are added modularly rather than baked in. The core is framework-agnostic, though official bindings exist for React. A key concept is its immutable state model, every change in the editor creates a new snapshot of the document state. This makes undo and redo reliable and also opens the door to real-time collaboration (multiple people editing the same document simultaneously), which it supports through integration with a library called Yjs. You would use Lexical when you are building a web product that needs a text editor, a CMS, a note-taking app, a chat tool with formatting, and you want full control over how that editor behaves rather than being locked into a third-party widget. It is written in TypeScript, published on npm, and created by Meta (Facebook).